Facing the existential threat posed by ISIS, many Christians have decided to take up arms in defense of their country and families.
The "Kataeb al-Babeliyyun" (Babylonian Brigades) are the formations of Iraqi Christians who have taken it upon themselves to fight ISIS's threat, next to their compatriots in the Popular Mobilization Forces, and are also currently taking part in the operations to liberate Mosul.
Historically speaking, Eastern Rite Christianity floorished in Babylon under Persian rule among other religions, and Babylon eventually became the seat of the Church of the East, until well after the Islamic conquest.